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Full text of "Alaskan glacier studies of the National Geographic Society in the Yakutat Bay, Prince William Sound and lower Copper River regions"

250
ALASKAN GLACIER STUDIES
Shoup Glacier is severely crevassed on this terminal fall but is little crevassed in the gentler slope above it (PL XCVTII, B) as far back as the ice fall at the elbow in the glacier. The front of the glacier is conspicuously free from d6bris-laden layers except in the basal portion just mentioned. On the surface there are no medial moraines and there is no lateral moraine on the eastern side, excepting below the elbow. The west side has a broad lateral moraine above the terminal ice fall, but this dirt and stone disappears in the crevasses so that except in the bottom ice there is practically no moraine on either margin at sea level.
Observations by Schroder and Grant,   As already stated, the Shoup Glacier was not
Contour interval I' DatDtn is approximately mean sea level
FIG. 24.   SKETCH MAP OF SHOOT GIAOTHIH IN 1909. Owing to an accident to the instrument used there are slight errors in elevations and distances.
seen by Whidbey in 1794, and we know of no observations by the Russians who entered Port Valdez. P. C. Schrader visited and photographed it in 1898 and Emil Mahlo first showed it upon a map, but with the bifurcation already alluded to. Schrader briefly described the glacier in a TJ. S. Geological Survey report.1 One of his photographs of the ice front, taken from a rocky knob on the west side of the bay (Photo. Station A), shows the exact conditions in 1898 and may be compared with photographs from the same site by the Coast Survey in 1901, by Grant in 1905 and 1908, and by the National Geographic Society's party in 1909 and 1910.
i See discussion of Canyon Creek Glacier valley in A Reconnaissance of a Fart of Prince William Sound and the Copper River District, Alaska, in 1898, Twentieth Amy Rept.,U. S. Geol. Survey, Fart VII, 1900, pp. 383-4.